Latest billionaires of 'Giving Pledge'

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Latest billionaires of 'Giving Pledge'

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Latest billionaires of 'Giving Pledge'

by CNBC Videos 1:54 mins

CNBC's Robert Frank reports there are now 122 signers of the "Giving Pledge," which is a promise started by Bill Gates and Warren Buffett for billionaires to give away at least half of their wealth. Frank also provides insight into the mystery tipper.

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